OMG you are the best Webie! :O
To be honest you are the first one to mention the level progression. Mmm I didn't really thought much of this and used some simple math for the score as you mentioned, panel (10 points * level * chaincombo if any). There's also a "Add+" button too that lets you add more panels (as in the tetris down button to speed things up so to speak) which would let you increase the numbers of panels on stage without having to wait so much for it to fill up. Just a way to speed things up for regular players. And yes playing at an increased level just adds more risk but rewards the player with higher scores, so starting at a higher level would be a good strategy too.
I guess I would have to review it sometime eventually! Thank you!